| With the axle load and traffic volume of the train raising in Chinese heavy railway lines,some phenomenon such as the overrun of lateral pier amplitude and the low transverse nature frequency have occured in part of the double-column piers in existing railway.These factors have seriously influences on the safety of the railway bridge transportations.In this dissertation,take the double-column pier of Shuohuang heavy haul railway as the research object,we study the strengthening technology of the double-column pier in existing railway with the method of finite element simulation analysis combining real bridge test.The main contents of this dissertation are as follows:(1)The transverse vibration characteristics and influencing factors of bridge piers are studied.The evaluation criteria about the transverse vibration of double-column piers in related specifications and scientific research achievements are analysed.The problems of common strengthening methods of double-column piers in Shuohuang heavy haul railway are proposed.(2)Take the double-column pier as the research object with the method of finite element simulation analysis,the effect of improved of lateral pier amplitude,transverse nature frequency and so on are compared between the addtion of shear brace of steel structure and surrounding concrete.The best strengthening method is selected.(3)According to the experimental data of real bridge operation performance,the change rule and the effect of improved of dynamic performance indexes of double-column piers before and after strengthened are analysed,which is used to verify the strengthening methods and the results of construction technology. |
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